Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1993-12-23
1997-05-06
Cintins, Ivars
Liquid purification or separation
Processes
Ion exchange or selective sorption
210682, 210688, B01D 1500
Patent
active
056267657
ABSTRACT:
A method of adsorbing and separating a heavy metal element by using a tannin adsorbent comprising:
(a) adjusting the pH of a solution containing a plurality of heavy metal elements to a predetermined pH;
(b) contacting the adsorbent with the solution in which the pH thereof is adjusted;
(c) adjusting the pH of the solution contacted with the adsorbent to a pH different from the predetermined pH; and
(d) contacting the solution in which the pH thereof is adjusted at the step (d) with the adsorbent prepared at the step (a).
According to the inventive method, all of the heavy metal elements can be efficiently separated and adsorbed by using a tannin adsorbent from a solution containing a number of heavy metal elements. A method of regenerating a tannin adsorbent are also disclosed.
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Kamei Yoshinobu
Shirato Wataru
Cintins Ivars
Mitsubishi Nuclear Fuel Company Ltd.
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